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Texas Instruments TL431AILPME3
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- Part No.:
- TL431AILPME3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
TL431AILPME3.pdf
- Description:
- IC VREF SHUNT ADJ 1% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,304
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Product details
Overview
TL431AILPME3 from Texas Instruments is a precision programmable shunt voltage reference IC with 1% initial tolerance at 25°C, adjustable output from 2.495 V to 36 V, −40°C to 85°C operating temperature range, 0.2 Ω typical dynamic impedance, and 1–100 mA sink-current capability. It serves as a stable feedback reference in isolated DC-DC converters, AC/DC power supplies, and industrial servo drive control modules.
For engineers reviewing the TL431AILPME3 datasheet, TL431AILPME3 pinout, TL431AILPME3 application, or TL431AILPME3 equivalent, this page delivers verified electrical specs, thermal performance data, SOT-23-3 package details, and real-world implementation guidance for power regulation design.
Technical Context
The TL431AILPME3 implements a three-terminal adjustable shunt regulator architecture with an internal 2.495 V reference and high-gain error amplifier. Its active output stage delivers sharp turn-on characteristics and low output noise-enabling direct replacement of Zener diodes in closed-loop feedback paths.
It operates across −40°C to +85°C (I-grade), supports cathode voltages up to 36 V, and maintains regulation with minimum cathode current of 0.4–0.7 mA. Dynamic impedance remains ≤0.5 Ω below 1 kHz, ensuring stable loop response in switching power supply feedback networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.470–2.520 V at 25°C (A-grade 1% tolerance); sets precise feedback threshold in voltage regulation loops |
| Temperature Range | −40°C to +85°C (I-grade); qualified for industrial power systems and motor drives |
| Dynamic Impedance | 0.2 Ω typical (≤0.5 Ω max @ ≤1 kHz); ensures minimal output voltage perturbation under load transients |
| Sink Current Range | 1–100 mA; supports direct interface with optocoupler LEDs and error amplifier outputs |
| Reference Input Current | 2–4 µA; enables high-impedance resistor-divider networks without significant loading error |
| Output Voltage Range | 2.495 V to 36 V (adjustable via two external resistors); covers wide range of isolated flyback and forward converter designs |
| Temp Drift (VI(dev)) | 14–34 mV over full temperature range; guarantees <±0.01%/°C effective drift in precision feedback applications |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm body size) with gull-wing leads; thermally efficient for surface-mount power regulation circuits.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: Cathode (K) | Shunt current output node | Connects to primary-side feedback network (e.g., optocoupler anode); sinks regulated current to maintain reference voltage |
| Pin 2: Anode (A) | Common return/reference ground | Typically tied to system ground or secondary-side common; defines voltage reference point for REF input |
| Pin 3: Reference (REF) | High-impedance threshold input | Monitors voltage divider output; triggers regulation when ≥2.495 V; draws only 2–4 µA |
Key Features
| Feature | Design Value |
|---|---|
| 1% Initial Accuracy (A-grade) | Reduces need for post-production calibration in industrial AC/DC adapters and server PSUs |
| 0.2 Ω Dynamic Impedance | Minimizes output voltage deviation during fast load steps in servo drive feedback loops |
| Low Reference Input Current (2–4 µA) | Enables use of high-value resistor dividers (>1 MΩ), lowering power loss and thermal drift |
| −40°C to +85°C Operation | Supports deployment in uncontrolled ambient environments like factory-floor motor controllers |
| Low Output Noise | Preserves signal integrity in sensitive analog feedback paths of notebook PC adapters |
Applications
| Rack Server Power Supply | Industrial AC/DC Converter |
|---|---|
Use Scenario: Primary-side feedback in isolated 1 kW telecom rectifier with optocoupler-coupled regulation loop. IC Role / Device Role / Timing Role: Precision shunt reference setting feedback threshold for PWM controller error amplifier. Use Value: 1% reference accuracy enables ±1.5% output voltage tolerance without trimming, reducing BOM cost and test time. |
Use Scenario: Secondary-side voltage sensing in 48 V/20 A industrial SMPS powering PLC I/O modules. IC Role / Device Role / Timing Role: Adjustable shunt reference generating stable 5 V auxiliary rail from main 48 V output. Use Value: 0.2 Ω dynamic impedance prevents output droop during 10 A step-load events, maintaining PLC logic stability. |
| AC Inverter Drive | Servo Drive Control Module |
Use Scenario: DC bus voltage monitoring and overvoltage protection circuit in 3-phase 7.5 kW VFD. IC Role / Device Role / Timing Role: Programmable threshold detector triggering shutdown when bus exceeds 800 V. Use Value: Adjustable 2.495–36 V range allows direct scaling to high-voltage sense resistors without additional op-amps. |
Use Scenario: Isolated feedback path for ±15 V dual-rail supply in servo amplifier gate driver stage. IC Role / Device Role / Timing Role: High-stability reference enabling <0.5% output ripple on critical analog control rails. Use Value: Low 14–34 mV temp drift ensures consistent gate bias across −10°C to +70°C cabinet temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBZR | 0°C to 70°C operation (C-grade), same 1% tolerance, identical SOT-23-3 pinout | Limited to commercial-temperature environments (e.g., consumer adapters); not rated for industrial ambient extremes | Select when cost sensitivity outweighs extended temperature requirement and ambient stays <70°C |
| TL431BIDBZR | 0.5% initial tolerance (B-grade), same −40°C to +85°C range, identical SOT-23-3 package | Higher accuracy enables tighter output regulation in medical or test equipment power supplies | Choose when ±0.5% output stability is required and budget permits premium grade |
Compared with TL431CDBZR, TL431AILPME3 adds −40°C startup capability and wider thermal margin; compared with TL431BIDBZR, it trades 0.5% accuracy for lower unit cost while retaining full industrial temperature compliance.
Availability
TL431AILPME3 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and servo drive control modules requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for TL431AILPME3 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in precision reference and power control ICs.
The TL431 family was designed specifically for high-reliability voltage regulation in isolated power supplies, offering programmable shunt reference functionality with industrial-grade thermal stability and robust ESD protection.
FAQ
What is the reference voltage tolerance of TL431AILPME3 at 25°C?
The TL431AILPME3 has a 1% initial reference voltage tolerance at 25°C, meaning its Vref falls within 2.470 V to 2.520 V under nominal conditions. This A-grade specification is confirmed in Section 6.9 of the TI SLVS543S datasheet and applies specifically to the I-temperature grade variant in SOT-23-3 packaging. The TL431AILPME3 maintains this tolerance without calibration.
What package type does TL431AILPME3 use, and what are its dimensions?
TL431AILPME3 uses the SOT-23-3 package with nominal body dimensions of 2.90 mm × 1.30 mm. Pin configuration follows standard TL431 DBZ layout: Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = REF. This compact footprint supports high-density PCB layouts in space-constrained power modules, and thermal resistance (RθJA) is 206°C/W per TI's published data.
Can TL431AILPME3 replace a Zener diode in feedback circuits?
Yes, TL431AILPME3 is explicitly designed as a superior Zener diode replacement in feedback circuits. Its active error amplifier provides sharp turn-on, low dynamic impedance (0.2 Ω), and adjustable output (2.495–36 V), unlike fixed-voltage Zeners. TI's datasheet confirms its use in on-board regulation, switching power supplies, and adjustable power supplies-exactly where Zener-based references fall short in accuracy and stability.
What is the minimum cathode current required for regulation in TL431AILPME3?
The TL431AILPME3 requires a minimum cathode current of 0.4–0.7 mA to maintain regulation, as specified in Section 6.9 (TL431AI electrical characteristics). This value is validated across the −40°C to +85°C range and ensures stable operation even at cold-start conditions in industrial power supplies. Below this threshold, the device exits regulation and Vref becomes undefined.
Does TL431AILPME3 support operation above 36 V cathode voltage?
No, TL431AILPME3 has an absolute maximum cathode voltage (VKA) rating of 37 V, with recommended operation limited to 36 V. Exceeding this violates Absolute Maximum Ratings in Section 6.1 and risks permanent damage. For >36 V applications, external clamping or series limiting must be implemented-TI does not specify safe operation beyond 36 V for TL431AILPME3.
TL431AILPME3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Series:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.495V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 100 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 700 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
TL431AILPME3 FAQ
1.How can I place an order for TL431AILPME3 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431AILPME3 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TL431AILPME3 reliable?
The price and inventory of TL431AILPME3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431AILPME3 is usually 5 days.
3.What payment methods are accepted for TL431AILPME3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431AILPME3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431AILPME3?
TL431AILPME3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431AILPME3 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TL431AILPME3?
For technical support, including TL431AILPME3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431AILPME3 requirements.
6.How does Aetrix verify that TL431AILPME3 is sourced from the original manufacturer or authorized distributors?
All TL431AILPME3 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TL431AILPME3 meets industry standards.
7.What is the process for return or replacement of TL431AILPME3?
All TL431AILPME3 units undergo pre-shipment inspection (PSI). If there is an issue with TL431AILPME3, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TL431AILPME3 part is unused and in its original packaging.
Return procedure for TL431AILPME3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431AILPME3 Tags
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TL431AIDBZR
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AZ431LBNTR-G1
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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